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The type of a type constructor

Illustration

When describing kinds, types are commonly referred to as "*", unary type constructors are referred to as "* -> *", etc. Let us draw illustrations from Language:Haskell:

  • () (i.e., the empty tuple type) is of kind "*".
  • ' (i.e., the list type constructor) is of kind "* -> *".
  • Either (i.e., the sum type constructor) is of kind "* -> * -> *".
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